AN ELECTROWEAK FACTORIZATION THEOREM

1989 ◽  
Vol 04 (12) ◽  
pp. 2977-2994
Author(s):  
S. LAKSHMIBALA ◽  
G. RAJASEKARAN
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Z Boson ◽  
Single Photon ◽  
Tree Level ◽  
Electroweak Theory ◽  
Factorization Property ◽  
Photon Exchange ◽  
Boson Exchange ◽  
Linearly Polarized

We prove a factorization property relating the photon exchange, the Z boson exchange and the electroweak interference terms of the differential cross-section for the process fermion+ antifermion→bosons occurring through the exchange of a single photon and a single Z boson. The property holds at tree-level when the bosons are unpolarized or linearly polarized and the fermions are unpolarized or longitudinally polarized. We have illustrated the factorization property with examples in the standard electroweak theory as well as its extensions and modifications.

scholarly journals Electroweak measurements from W, Z and photon final states

2014 ◽  
Vol 31 ◽  
pp. 1460276
Author(s):  
Hang Yin ◽  
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Z Boson ◽  
W Boson ◽  
Charge Asymmetry ◽  
Distribution Functions ◽  
Boson Mass ◽  
Electroweak Theory ◽  
Final States ◽  
Parton Distribution Functions

We present the most recent precision electroweak measurements of single W and Z boson cross section and properties from the LHC and Tevatron colliders, analyzing data collected by ATLAS, CDF, CMS, D0, and LHCb detectors. The results include the measurement of the single W and Z boson cross section at LHC, the differential cross section measurements, the measurement of W boson mass, the measurement of W and Z charge asymmetry. These measurements provide precision tests on the electroweak theory, high order predictions and the information can be used to constraint parton distribution functions.

TESTING SOME PROPERTIES OF NEUTRAL CURRENT NEUTRINO INTERACTIONS IN NEUTRINO COUNTING REACTION

1988 ◽  
Vol 03 (03) ◽  
pp. 721-729 ◽  
Author(s):  
P. RAM BABU
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Z Boson ◽  
Neutral Current ◽  
Z Bosons ◽  
Coupling Constant ◽  
Neutral Currents ◽  
Lorentz Structure ◽  
Neutrino Interactions

We have considered the ‘neutrino counting’ reaction [Formula: see text]. We restrict to V, A Lorentz structure of weak neutral interaction (WNI), allow many Z bosons to mediate WNI and νi to be different from νj. We derive the expression for differential cross section by allowing the polarizations of e+ and e− but summing over the polarizations of final photons. From the study of differential cross section with polarized and unpolarized beams three different coupling constant combinations can be determined. A definite relation between these observables and the observables in [Formula: see text] scatterings is suggested as a test of single-Z-boson hypothesis. Similarly another test relates observables in [Formula: see text] to those of [Formula: see text] scatterings. By assuming universality a test for presence of nondiagonal neutrino neutral currents (NDνNC’s) is also pointed out. The effects of presence of wrong-handed (anti-) neutrinos on our tests are also discussed. As a by-product, we find a way to determine number of neutrino types, in the case i≠j, assuming universality.

SCATTERING AMPLITUDE ZERO IN dū→γH−

1988 ◽  
Vol 03 (12) ◽  
pp. 1199-1203 ◽  
Author(s):  
XIAO-GANG HE ◽  
H. LEW
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Scattering Amplitude ◽  
Higgs Bosons ◽  
Factorization Property ◽  
High Energies ◽  
Charged Higgs ◽  
Charged Higgs Bosons

In models with physical charged Higgs bosons, the angular distribution of dū→γH− exhibits a factorization property. The differential cross section has a zero at the scattering cos -1(-⅓) in the γH− C.M. frame. The processes [Formula: see text] are also studied. It is found, at high energies, that the contribution of the sea quarks are significant enough to wash the zero away.

scholarly journals Investigating Scalar Unparticle Production at Collisions with Polarized Beams in Unparticle Physics

2020 ◽  
Vol 36 (4) ◽  
Author(s):  
Le Nhu Thuc ◽  
Dao Thi Le Thuy
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Z Boson ◽  
Collision Energy ◽  
High Energy ◽  
Polarized Beams ◽  
Boson Exchange ◽  
The Cross ◽  
Muon Colliders ◽  
Energy Frontier

Scalar unparticle production in the process is studied from unparticle physics perspective. We have calculated and evaluated the cross sections for muon and Z boson exchange when the  beams are initially polarized. Numerical calculations show that the cross section of collisions depends strongly on the polarized condition of the initial beams and the collision energy . The results are plotted in the energy reach available at the present accelerators and the future high energy frontier muon colliders as shown in the scheme by Muon Accelerator Program (MAP) and other different colliders.

scholarly journals The effect of vacuum polarization on muon–proton scattering at small energies and angles

2002 ◽  
Vol 80 (1) ◽  
pp. 39-42
Author(s):  
A Gashi ◽  
G Rasche ◽  
W S Woolcock
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Vacuum Polarization ◽  
Proton Scattering ◽  
Photon Exchange ◽  
Exchange Approximation ◽  
Compact Expression ◽  
The One ◽  
Flip Amplitude

We give a compact expression for the unpolarized differential cross section for muon–proton scattering in the one-photon exchange approximation. The effect of adding the vacuum polarization amplitude to the no-spin-flip amplitude for one-photon exchange is calculated at small energies and scattering angles and is found to be negligible for present experiments. PACS No.: 13.6

scholarly journals Top Quark Pair-Production in Noncommutative Standard Model

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
M. Fisli ◽  
N. Mebarki
Keyword(s):  
Lower Bound ◽  
Standard Model ◽  
Differential Cross Section ◽  
Pair Production ◽  
Cross Section ◽  
Differential Cross ◽  
Top Quark ◽  
Tree Level ◽  
Hadron Collision ◽  
Geometry Parameter

The differential cross-section of the top quark pair production via the quark-antiquark annihilation subprocess in hadron collision is calculated within the noncommutative standard model. A pure NC analytical expression for the forward-backward asymmetry at the tree level is obtained. Moreover, using recent Tevatron results from the full RUN2 data, a new lower bound on the noncommutative geometry parameter is deduced.

RADIATIVE CORRECTIONS TO $e^ + e^ - \to \bar tt$ IN ELECTROWEAK THEORY

1988 ◽  
Vol 03 (06) ◽  
pp. 581-587 ◽  
Author(s):  
JUNPEI FUJIMOTO ◽  
YOSHIMITSU SHIMIZU
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Quark Mass ◽  
Photon Emission ◽  
Electroweak Theory ◽  
Radiative Corrections ◽  
Top Quark Mass ◽  
Hard Photon ◽  
Boson Exchange ◽  
Large Correction

The 0(α) radiative corrections to [Formula: see text] are calculated in the standard SU(2)×U(1) theory keeping the top quark mass. The contribution of the hard photon emission is included with suitable experimental cuts. We found that the 1-loop vertex diagrams for the top quark give rise to a fairly large correction in the order of 5% to the differential cross-section. Effects of the Higgs boson exchange are also discussed.

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